poptimists | What is the sound of now?

In yesterday's conversation about Pizzicato Five and pop, Cis drew a kind of distinction between pop which obeys current sonic rules and pop which refuses to (apols if my precis loses a lot of subtlety).

This interested me and got me thinking what the current rules of pop might be - not just in terms of sound, but attitude, look, emotional content, trends, etc.

What characterises late 00s pop? What is happening now which wouldn't or couldn't have happened before? What will allow a kid in ten years time to identify music from now? (in the way that a music fan who had never heard records or seen pictures of Suzi Quatro, or A Flock Of Seagulls, or Ned's Atomic Dustbin might be able to put them in place and time)